Brackish water refers to something between fresh water and seawater. According to Merriam-Webster Online, it comes from a Dutch word meaning salty. Does English have any relative words to it?

The second meaning of brackish is having bad taste, according to the same source. I don't quite get why being salty has come to be associated with bad taste of food but have a first-hand experience. I once added salt into tea from what I believed to be a sugar pot. I will never forget how brackish that brackish black tea was that I helped myself to.

BTW, as the average salinity of seawater is 3.5%, I am just wondering if any salt concentration from just below 3.5% to almost 0% fits in the definition of brackish water.